Year	% of total merchandise exports
1964	0.07961783439490447
1969	0.022677593907286436
1970	0.05440968270271771
1971	0.019237037709937534
1972	0.15274275474164023
1973	0.00935642210418736
1974	0.3151777281421088
1975	0.03225195977301017
1977	0.0004711351215528614
1979	0.00864877840417683
1987	0.002555082971659308
2010	0.010948575185542054
2011	0.1564476676960297
2012	0.05195445087698944
2013	0.5521553917924287
2014	0.6713606488239051
2015	0.6117828158174277